COMP Cams K31-600-9 Thumpr 227/241Hydraulic Roller & Evolution Lifter K-Kit, Ford 221-302

The COMP Cams Thumpr camshafts delivers signature lopey idle, strong low-mid RPM torque, and improved horsepower. Ideal for street/strip builds looking for aggressive sound, throttle response, and classic muscle performance.

The COMP Cams Thumpr camshaft delivers a signature lopey idle, strong low- to mid-RPM torque, and improved horsepower, making it ideal for street/strip builds seeking aggressive sound, throttle response, and classic muscle performance. Designed for high-performance street applications, it provides an unmistakable idle quality while pairing exceptionally well with popular upgrades like the Edelbrock RPM Air Gap intake manifold and TCI Saturday Night Special torque converter. Built withfull-size base circles for added durability, this cam works seamlessly with COMP Cams Evolution hydraulic roller tappets and eliminates the need for dog bones and lifter retainers—components never intended for pre-1985 applications. This camshaft supersedes part number K31-600-8, delivering proven performance and simplified valvetrain compatibility in one upgraded design.

Features

• Features full-size base circles, works seamlessly with our Comp Cams Evolution hydraulic roller tappets.
• Eliminates the need for dog bones and lifter retainers, which were never intended for use in pre-1985 applications.
• Supersedes K31-600-8

Specifications

Installation Guide: Download PDF

⚠️ California Proposition 65 Warning
California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.